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High-Resolution, Flexible, and Full-Color Perovskite Image Photodetector via Electrohydrodynamic Printing of Ionic-Liquid-Based Ink

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Direct full-color image photodetectors without dichroic prisms or sophisticated
color filters have considerable advantages in target recognition and information
acquisition for electronic eyes and wearable sensors. However, the ability
to combine various multispectral semiconductors in a high-resolution and
cost-effective manner is still challenging. Here, high-resolution electrohydrodynamic
(EHD) printing, together with ionic liquid methylammonium acetate
(MAAc) as the solvent, is first introduced to directly integrate various spectralresponse
perovskite films into a pixelized full-color photodetector. EHD printing
enables micro/nanopatterning by using high electrical force to induce jetting,
and MAAc improves film quality with scant pinholes and large-size grains by
decreasing the perovskite growth rate. By optimizing the printing process and
crystallization condition, 1 μm perovskite dot arrays are EHD printed; this is, to
the best of knowledge, the smallest printed feature size of perovskite application.
And the photodetector still achieves high R and D* values of 14.97 A W-1
and 1.41 × 1012 Jones, respectively. Finally, an integrated flexible full-color image
photodetector is constructed, which successfully realizes light signal detection
and color recognition, paving a versatile and competitive approach for future
full-color image sensors and artificial vision systems.

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